Returning device for calculating-machines.



No. .670,075. Patented Mar. 19, 19m.

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BETURNING DEVICE FOH CALGULATING MACHINES.

- (Application med Feb. 7, 1900.) Y(llo Model.)

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UNITED STATES PATENT EEICE.

WOLDEMAR HEINITZ, OF DRESDEN, GERMANY.

RETURNING DEVICE FOR CALCULATBNGEMCHINES.

SPECIFICATION forming' part of Letters latent No. 670,075, dated March19, 1901.

Application filed February 7, 1900. `Serial No. 4,372. (No inntlel.)

To al?, whom, t may concern:

Be it known` that I, WOLDEMAE HEINITZ, a citizen of the Kingdom ofSaxony, and a resident of Dresden, Saxony, Germany, (whose post-officeaddress is Dresden A, Bergmannstrasse No. '23,) have invented certainnew and useful Improvements in Returning Devices forCalc-ulating-Machines, of which the following is a specification.

The object of my invention is a returning device for the register ornumber wheels of calculati11g-machines of the duplex type, the returningto zero of the register-wheels being effected by a single lever motion.

The eccentric disks are actuated by cogs, causing the disks to turnuntil the part nearest to the turning axle is reached, theregister-wheels in this position presenting the number O beneath thesight-slots.

The accompanying drawings show my invention applied to acalculating-machine of the duplex type provided with two rows ofregister-wheels.

Figure l is a front view of a part of such a machine. Fig. 2 is a cutthrough same following the line A A, the register-wheels being returnedto Zero. Fig. 3 shows the same parts in another position, the cogs justbegin ning to effect the returning of the registerwheels.

The register-wheels a and b of a duplex calculating-machine are actuatedby the gearwheel c, Fig. 3, possessing teeth to be thrown in and out ofgear. An eccentric disk d is fixed to the register-wheel a, Fig. 2, saiddisk being shaped like a heart and ending in a protruding nose e,actuating the wellknown teens-gearing device.

ln front of the wheels CL pawls g, ending in noses 7L, are fastened to ashaftf, actuated by the hand-lever t'. On turning the shaft and bringingthe pawls in contact with the eccentric disks CZ thelatter are compelledby the peculiarly-shaped noses h to turn around their axle until thenose has reached the point 75 on the circumference of the disk nearestto the axle, the circumference here being formed by two convergingcurves. The levert' and the pawls g are brought back int-o position byaid oi a spring.

The device described above has already been made use of in some of theolder types of calculating-machines. A similar arrangement effecting thereturn of the second reg istering device of a duplex machine forms thesubject of this invention.

The second registering device of a duplex machine consists of barrels h,being likewise actuated by aid of the gearing-wheel c. Their axle bearsan eccentric disk composed of two halves of a heart shaped disk, thesetwo halves pointing to opposite directions. By turning a lever m one endo1' the other of a fang n below the barrel may be brought into contactwith the eccentric disk Z. The peculiar shape of both the eccentric andthe fang then causes a turning of the former until the lowest point nearthe axle is reached. This position corresponds with the appearing of thenumber 0 beneath the sightslot.

Having thus described the nature of my invention, what l claim as newisl. ln a returning device forcalculatingmachines the combination withthe registerwheels of eccentric disks having the shape of two halves ofa heart pointing in opposite directions, substantially as shown anddescribed.

2. In a returning device for calculating-machines the combination withthe registen wheels and eccentric disks having the shape of two halvesof a heart pointing in opposite directions, of a shaft bearing fangsadapted to glide on the circumference of said eccentrics, substantiallyas shown and described.

ln testimony whereof I affix my signature in presence of two witnesses.

l/VGLDEMAR HEINITZ.

Vitnesses:

WOLDEMAE HAUPT, HENRY HASPEE.

